// 4.3 给方法传递对象

class Letter{
    char c;
}

public class PassObject {
    static void f(Letter y){
        y.c = 'z';
    }
    public static void main(String[] args) {
        Letter x = new Letter();
        x.c = 'a';
        System.out.println("1: x.c: " + x.c);
        f(x);   //因为f为一个静态对象f内的c并未改变。
        System.out.println("2: x.c: " + x.c);
    }
}
